Thrashing-machine tooth



(No Model.)

Z. MAGOMBER. .THRASHING MACHINE Toom.

10.472,131. .Patentedfxpn 5, 1,892.

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ZEBEDEE MACOMBER, OF BEDFORD, ASSIGNOR TO THE UNION MANUFAC- TUBING COMPANY, OF BATTLE CREEK, MICHIGAN.

THRASHING-IVIACHINE TOOTH.

SPECIFICATION forming part of Letters Patent No. 472,131, dated April 5, 1892. Application filed November 3, 1891. Serial No. 410,805. (No model.)

To all whom it may concern:

Be it known that I, ZEBEDEE MAOOMBER, a citizen of the United States, residing at Bedford, county of Calhoun, State of Michigan, have invented a new and useful Thrashing- Machine Tooth, of which the following is a specification.

This invention relates to detachable teeth for the cylinders and concaves of thrashingmachines.

The object of this invention is to construct a tooth which will facilitate the scouring of the heads of straw andthe separation of the grain therefrom without crushing or breaking the same and at the same time can be connected with old cylinders and concaves already in use in order to provide them with teeth.

Other objects will appear in the description and in the claims.

In the drawings forming a part of this specification, Figure 1 is a side elevation of one of the teeth to be attached to the cylinder; Fig. 2 an elevation of Fig. 1, looking from a point at the right. Fig. 3 is a side elevation of a tooth for attachment to the concave; and Fig. 4t is a section on line 2 2 in Figs. l and 2, looking from a point above.

Referring to the lettered parts of the drawings, A is a tooth made of a suitable form, provided with the ordinary screw-threaded portion B, and which is secured in holes in the cylinder or concave at the base of the tooth, and at the juncture of the pendent portion are two laterally-extending fins s s, the bottom portion of which iins comes against the surface of the cylinder or concave, as the case may be, and thus the back ns act as a brace to prevent the teeth from canting in that direction; but so far as these back iins are concerned, while they are benecial as a brace, they may be dispensed with so far as the front fins are concerned. In Fig. 1 the bottom surface of the fins is adapted to fit against the surface of the bars of the cylinder, which bars are comparatively fiat, while in Fig. 3 the bottoniV surface of the fins s s is slightly convex to fit the concave surface of the concave cylinder. No cylinders and concaves are here shown, but will be readily understood by those versedin the art, itbeing understood,of course,

that the pendent portions B pass into said parts and are held by a nut on the lower threaded end of said pendent portions. These fins s s are integral with the teeth A and their upper periphery curves lor slants downward from their upper point of connection with said teeth, and they also are made rounding or slanted laterally each way from said periphery, as indicated at e in Figs. 1 and 4, so as to present an edge o, past the side of which the straw passes when coming in contact with the said surface e. The advantage of this over some other constructions in which the base of the teeth have been angular or the teeth themselves have been angular 1s that in the present instance the grain is not broken, as in said other styles, but is successfully rubbed out of the heads of the grain, since the ns of the cylinder-teeth come 1n sufliciently close relation with the fins of the teeth of the concave to rub the heads of the grain between the rounding surfaces of the fins of the teeth without crushing the same.

Some concaves have heretofore been provided with lrounded or oval projections, which are integral with the surface of said concave and between which projections the tooth was inserted.

By means of my tooth in Fig. 3, with its 1ntegral fins, a concave not having the integral projections may be provided with my tooth, thus imparting to it all the benefits of these projections, of which the lins s s are a substitute, without necessitating the manufacture of a new concave in old machines which are not provided with said projections.

My tooth in Fig. 1, with its integral fins, can be attached to the cylinder of new machines or to old cylinders, thus providing the bars around the periphery of the cylinders with teeth having these fins s s. This will be found very desirable, since the bars of the cylinders which bear the teeth are made of wroughtiron and could not be provided with the said projections representing the fins by casting them as the concaves are cast.

At .e z, Figs. 1 and 3, the sides of the tooth A near and where it joins the fins s 8 are cut or beveled away, so as to extend the rounding surface e up'onto said tooth, thus depriving it of any angularity at the point where the IOO grain might otherwise be cracked but for said cut-away portion. While this cut-away portion ,e is deemed to be beneiicial, in some instances it might not be necessary. Another point of utility of these cut-away portions z and fins s on the front side of the tooth will be seen in the operation of the machine. The grain being fed into the machine, the teeth will force the grain down upon the fins, and they in turn will cause it to lift up and settle back against the cut-away portion z, so that unthrashed grain will pass between the fins and below the teeth A. I

For the reasons before given these teeth may become a commodity in trade for supplying old machines, or when used in new machines they may be readily detached from the cylinder or concave and new teeth supplied.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent ot' the United States, is

l. A thrashing-tooth provided at that point where the tooth joins its shank with the integral tins projecting in opposite directions from each other, the upper edge of said tins curving or slanting downward to the cylinder or concave to which they are attached, said fins also being rounded or beveled on each side backward from their upper edge, and the tooth above said edge having the beveled cut-away portion, substantially as set forth.

2. A thrashing-tooth provided with an integral fin on itsfront side, the upper edge of said iin being curved downward from the tooth at its point of contact with the cylinder or concave and rounded or beveled backward on each side from its upper edge, said tooth just above the upper edge of said iin having the beveled cut-away portion, substantially as set forth.

In testimony to the foregoing l have hereunto subscribed my name in the presence of two witnesses.

ZEBEDEE MACOMBER.

Vitnesses:

CHARLES T. ALLEN, NICHOLAS A. VYNE. 

